Vacuum fuel-feed system.



W. JAY.

VACUUM FUEL FEED SYSTEM APPLICATION FILED JAN. 2. I918.

1,279,,1 16, V Patented Sept. 17,1918,

Q 4 a! i I ll \j/ u 2 m a WEBB JAY, OF CHICAGO, ILLINOIS.

VACUUM FUEL-FEED SYSTEM.

Specification of Letters Patent.

Patented se t. it. 1918.

Application filed January 2, 1918. Serial No. 209,874.

improved means for obviating the danger of overflow or discharge of liquid fuel or vapor thereof from the reserve chamber in case of overheating of the apparatus. It consists in the elements and features of construction shown and described, as indicate in the claim. 7

In the drawings Figure 1 is a side elevation, somewhat diagrammatic, showing a familiar type of vacuum fuel feed system installed upon the engine of an automobile.

Fig. 2 shows the several parts of such system partially in vertical-section, and diagrammatically as to their relative positions.

In the drawings 1 is the main low level fuel supply tank. 2 is a conduit leading from the main'low level tank to the vacuum chamber, 3, of the fuel feed device from which fuel .is discharged by gravity past the check valve, 4, into-the fuel reserve chamber or reservoir, 5, for supplying the carbureter through a pipe, 6, leading to the carbureter float chamber, 7 The chamber, 3, has an atmosphere inlet, 8, and a suction outlet, 9, from whicha suction pipe, 10,

leads to any suitable source of suction, as

for example, the pipe, 11, of the 'intake manifold of the engine. Any suitable means may be employed for alternating the dominance of atmospheric pressure in the vacuum chamber, 3, such as. a snap action device, 13,

connected with the valves, 14 and-15, controlling respectively the atmosphere inlet and suction ports, and operated by the float, 16. From the upper part of the fuel reserve chamber, 5, a duct, 17 connects with api'pe,

18, leading to the carbureter float chamber. It will be understood that the carburetor fioatchamber is open to atmospheric prespipe.

sure, as is usual, so that atmospheric pressure is admitted through the pipe, 18, to the liquid in the fuel reserve chamber, 5, permitting its contents to be discharged by gravity, as is desired, to the carbureter when the carbureter inlet valve is opened by the V float inthe float chamber as usual.

The operation of the device is' that which is customary in vacuum fuel feed devices of this type. The characteristic of the structure shown constituting the invention there- -in, consists in extending the air vent pipe,

18, from the fuel reserve chamber, 5, to the carbureter float chamber, as shown, thereby obviating the danger whichin the absence of any provision to the contrary is liable to arise, of the discharge of liquid fuel or vapor through the air vent pipe onto the engine and in position where it is liable to become ignited when through overheating of the device, pressure is generated in the chamber, 5, or in the chamber, 3, so as to operate on the chamber, 5, for forcing the contents thereof out through the air vent With the construction shown, any overflow thus caused, passing to the carbureter float chamber, operates precisely as if it had passed to that chamber through the usual channel, and all damage which. might otherwise result therefrom is prevented.

I claim In avacuum fuel feed system, in combi-- nation with a vacuum chamber, a main low level supply tank; a liquid conduit from voir into which the vacuum chamber discharges liquid fuel, a valve controlling such discharge; means for alternating the dominance of suction and pressure on the liquid contents of the vacuum chamber; a carbureter fuel chamber open to atmospheric pressure, and an air vent pipe leading from the fuel reserve chamber of the vacuum fuel feed device to the upper: part of said carbureter fuel chamber.

In testimony whereof I have hereunto set my hand at Chicago, Illinois, this 12th day of'December, 1917.

WEBB JAY. 

